Make OWNER TO subcommand mention consistent

We say 'OWNER TO' in the synopsis; let's use that form elsewhere.

There is a paragraph in the <note> section that refers to various
subcommands very loosely (including OWNER); I didn't think it was an
improvement to change that one.

This is a fairly inconsequential change, so no backpatch.

Author: Amit Langote
Discussion: https://postgr.es/m/69ec7b51-03e5-f523-95ce-c070ee790e70@lab.ntt.co.jp

doc/src/sgml/ref/alter_table.sgml

@@ -713,7 +713,7 @@ ALTER TABLE [ IF EXISTS ] <replaceable class="parameter">name</replaceable>
    </varlistentry>
 
    <varlistentry>
-    <term><literal>OWNER</literal></term>
+    <term><literal>OWNER TO</literal></term>
     <listitem>
      <para>
       This form changes the owner of the table, sequence, view, materialized view,